The fundamental ideas of chemistry Flashcards
1
Q
What are all substances made of?
A
Atoms
2
Q
How many different types of element are there?
A
100
3
Q
What is in the nucleus?
A
Protons and neutrons
4
Q
In an atom what is the number of protons equal to?
A
The number of electrons
5
Q
The sum of protons and neutrons is what?
A
The mass number
6
Q
Why are noble gases unreactive?
A
They have a full outer shell so they are stable
7
Q
Which atoms formed positively charged atoms?
A
Metal atoms
8
Q
What ions do non metal atoms form?
A
Negatively charged ions
9
Q
What is the charge of protons, neutrons and electrons?
A
+1, 0 and -1
10
Q
How many electrons can the first shell hold?
A
2
